摘要
以硅酸钠为硅源,硫酸铝为铝源,在极浓体系中合成方沸石。考察氢氧化钠用量、乙二胺用量、硅铝比和晶种对合成方沸石结构的影响,研究对甲醇转化制烯烃的催化性能。XRD结果表明,合成方沸石结构主要以立方晶系为主,还有四方晶系和正交晶系。方沸石对甲醇转化制烯烃的活性较低,甲醇最大转化率为68.2%,主要产物的收率分别为甲烷15.64%、乙烯2.81%、丙烯5.60%、C_4 11.29%、C_5 16.65%和C_6^+ 14.18%,其催化性能明显低于ZSM-5分子筛。
Analcime was synthesized by extremely dense system with sodium silicate as silica source and aluminum sulfate as aluminum sources. The influence of the dosage of sodium hydroxide and 1,2-ethylenediamine, molar ratio of silica to alumina and different crystal seeds on the structure of as-synthesized analcime and its catalytic properties for methanol to olefins were investigated. XRD results showed that the main crystal structure of analcime was cubic crystal system, including orthorhombic system and tetragonal system. The catalytic activity of analcime for methanol to olefins was lower than that of ZSM-5 zeolite and the maximum conversion of methanol reached 68.2%. The yield of main products, such as methane, ethylene, propylene, C4, C5 and C6 ,was 15.64% ,2.81% ,5.60% ,11.29% ,16.65% and 14.18%, respectively.
出处
《工业催化》
CAS
2010年第6期13-18,共6页
Industrial Catalysis
基金
国家自然科学基金项目(20476060)
国家重大基础研究项目(2004CB217806)
关键词
催化化学
方沸石
晶系
合成条件
甲醇转化
catalytic chemistry
analcime
crystallographic system
synthesis condition
methanol conversion
